| 摘要 |
PROBLEM TO BE SOLVED: To provide a compact and low-priced seal device for an electric power tool. SOLUTION: In an impact wrench with the structure that an output shaft 11a of an electric motor passing through a shaft hole 34 of a gear case 31 is supported freely to rotate by a bearing 35 arranged in the shaft hole 34, a sheet-like seal material 41 is arranged in a side surface of the bearing 35. The sheet material 41 is fixed to the side surface of an outer ring 35b, and slides with a side surface of an inner ring 35a to seal an annular clearance 35c between both the rings, and prevents a leak of the grease inside of the gear case 31 to the outside through the annular clearance 35c. The seal material 41 is formed of a sheet material of the ethylene tetra-fluoride. With this structure, the compact and low-priced seal device for the electric power tool having a small friction resistance is obtained.
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